The beam shown has a 30-ft. simple span; f = 5,000 psi, fps = 250,000 psi, and the initial prestress is 160,000 psi. Assume fpy = 0.85 fpu a. Find the concrete stresses in the top and bottom of the beam at midspan immediately after the tendons are cut; b. Assume 20% prestress losses in the tendons, find the new stresses at the top and bottom at midspan; c. Find the maximum service live load that the beam can support if allowable stresses of 0.60f, in compression and 12√ √f'c in tension are permitted. 21 in. 24 in. 0.9 in.² 3 in. -14 in.

The beam shown has a 30-ft. simple span; f = 5,000 psi, fps = 250,000 psi, and the initial prestress is 160,000 psi. Assume fpy = 0.85 fpu a. Find the concrete stresses in the top and bottom of the beam at midspan immediately after the tendons are cut; b. Assume 20% prestress losses in the tendons, find the new stresses at the top and bottom at midspan; c. Find the maximum service live load that the beam can support if allowable stresses of 0.60f, in compression and 12√ √f'c in tension are permitted. 21 in. 24 in. 0.9 in.² 3 in. -14 in.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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